3. Modeling A#
3.1. Characteristics of modeling#
2D modeling in plane deformations. This modeling corresponds to methodology 3 from the documentation [U2.04.06]: excavation with support with constraint initialization by calling CREA_CHAMP and deconfinement using a method of chaining models.
3.2. Characteristics of the mesh#
Number of nodes: |
8477 |
Number of meshes: |
3304 type QUAD8 |
3.3. Calculation process#
The objective of this test case is to test a method. The following table shows the main steps that structure the command file.
Orders |
Reviews |
CREA_CHAMP |
Initialization of geostatic constraints (here isotropic \(5\mathrm{MPa}\) in compression) |
STAT_NON_LINE |
Blocking the nodes in the gallery to calculate the nodal reactions to be injected to simulate deconfinement |
CREA_CHAMP |
Recovery of nodal reactions |
STAT_NON_LINE |
Reinjecting nodal reactions |
STAT_NON_LINE |
Intermediate calculation to go from a model without a mesh representing concrete segments to a model with cells representing them (see [bib2]) |
STAT_NON_LINE |
Progressive deconfinement of the Massif |
3.4. Tested sizes and results#
After the installation of the coating (final moment), the components \({\sigma }_{\mathrm{xx}}\) and \({\sigma }_{\mathit{yy}}\) are tested at the nodes \(\mathrm{N2}\) and \(\mathrm{N6}\) as well as the radial displacement at these points (\(\mathrm{DX}\) for \(\mathrm{N2}\), \(\mathrm{DY}\) for \(\mathit{N6}\)).
Reference |
Aster |
Difference (%) |
|
Knot \(\mathrm{N2}\) |
|||
|
-1,52821.106 |
-1,53154.106 |
0.218 |
|
-8,47179,106 |
-8.52772.106 |
0.660 |
\(\mathrm{DX}\) |
-1,6925.10-3 |
-1,6684.10-3 |
-1.422 |
Knot \(\mathrm{N6}\) |
|||
|
-8,47179,106 |
-8,41147.106 |
-0.712 |
|
-1,52821.106 |
-1,52943.106 |
0.080 |
\(\mathrm{DY}\) |
-1,6925.10-3 |
-1.7184.10-3 |
1,529 |